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llvm-mirror/unittests/Analysis/ValueLatticeTest.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===- ValueLatticeTest.cpp - ScalarEvolution unit tests --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ValueLattice.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "gtest/gtest.h"
namespace llvm {
namespace {
// We use this fixture to ensure that we clean up ScalarEvolution before
// deleting the PassManager.
class ValueLatticeTest : public testing::Test {
protected:
LLVMContext Context;
Module M;
ValueLatticeTest() : M("", Context) {}
};
TEST_F(ValueLatticeTest, ValueLatticeGetters) {
auto I32Ty = IntegerType::get(Context, 32);
auto *C1 = ConstantInt::get(I32Ty, 1);
EXPECT_TRUE(ValueLatticeElement::get(C1).isConstantRange());
EXPECT_TRUE(
ValueLatticeElement::getRange({C1->getValue()}).isConstantRange());
EXPECT_TRUE(ValueLatticeElement::getOverdefined().isOverdefined());
auto FloatTy = Type::getFloatTy(Context);
auto *C2 = ConstantFP::get(FloatTy, 1.1);
EXPECT_TRUE(ValueLatticeElement::get(C2).isConstant());
EXPECT_TRUE(ValueLatticeElement::getNot(C2).isNotConstant());
}
TEST_F(ValueLatticeTest, MergeIn) {
auto I32Ty = IntegerType::get(Context, 32);
auto *C1 = ConstantInt::get(I32Ty, 1);
// Merge to lattice values with equal integer constant.
auto LV1 = ValueLatticeElement::get(C1);
EXPECT_FALSE(LV1.mergeIn(ValueLatticeElement::get(C1), M.getDataLayout()));
EXPECT_TRUE(LV1.isConstantRange());
EXPECT_EQ(LV1.asConstantInteger().getValue().getLimitedValue(), 1U);
// Merge LV1 with different integer constant.
EXPECT_TRUE(LV1.mergeIn(ValueLatticeElement::get(ConstantInt::get(I32Ty, 99)),
M.getDataLayout()));
EXPECT_TRUE(LV1.isConstantRange());
EXPECT_EQ(LV1.getConstantRange().getLower().getLimitedValue(), 1U);
EXPECT_EQ(LV1.getConstantRange().getUpper().getLimitedValue(), 100U);
// Merge constant range with same constant range.
EXPECT_FALSE(LV1.mergeIn(LV1, M.getDataLayout()));
EXPECT_TRUE(LV1.isConstantRange());
EXPECT_EQ(LV1.getConstantRange().getLower().getLimitedValue(), 1U);
EXPECT_EQ(LV1.getConstantRange().getUpper().getLimitedValue(), 100U);
// Merge LV1 in undefined value.
ValueLatticeElement LV2;
EXPECT_TRUE(LV2.mergeIn(LV1, M.getDataLayout()));
EXPECT_TRUE(LV1.isConstantRange());
EXPECT_EQ(LV1.getConstantRange().getLower().getLimitedValue(), 1U);
EXPECT_EQ(LV1.getConstantRange().getUpper().getLimitedValue(), 100U);
EXPECT_TRUE(LV2.isConstantRange());
EXPECT_EQ(LV2.getConstantRange().getLower().getLimitedValue(), 1U);
EXPECT_EQ(LV2.getConstantRange().getUpper().getLimitedValue(), 100U);
// Merge LV1 with overdefined.
EXPECT_TRUE(
LV1.mergeIn(ValueLatticeElement::getOverdefined(), M.getDataLayout()));
EXPECT_TRUE(LV1.isOverdefined());
// Merge overdefined with overdefined.
EXPECT_FALSE(
LV1.mergeIn(ValueLatticeElement::getOverdefined(), M.getDataLayout()));
EXPECT_TRUE(LV1.isOverdefined());
}
TEST_F(ValueLatticeTest, getCompareIntegers) {
auto *I32Ty = IntegerType::get(Context, 32);
auto *I1Ty = IntegerType::get(Context, 1);
auto *C1 = ConstantInt::get(I32Ty, 1);
auto LV1 = ValueLatticeElement::get(C1);
// Check getCompare for equal integer constants.
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_EQ, I1Ty, LV1)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SGE, I1Ty, LV1)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SLE, I1Ty, LV1)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_NE, I1Ty, LV1)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SLT, I1Ty, LV1)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SGT, I1Ty, LV1)->isZeroValue());
auto LV2 =
ValueLatticeElement::getRange({APInt(32, 10, true), APInt(32, 20, true)});
// Check getCompare with distinct integer ranges.
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SLT, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SLE, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_NE, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_EQ, I1Ty, LV2)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SGE, I1Ty, LV2)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::ICMP_SGT, I1Ty, LV2)->isZeroValue());
auto LV3 =
ValueLatticeElement::getRange({APInt(32, 15, true), APInt(32, 19, true)});
// Check getCompare with a subset integer ranges.
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_SLT, I1Ty, LV3), nullptr);
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_SLE, I1Ty, LV3), nullptr);
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_NE, I1Ty, LV3), nullptr);
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_EQ, I1Ty, LV3), nullptr);
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_SGE, I1Ty, LV3), nullptr);
EXPECT_EQ(LV2.getCompare(CmpInst::ICMP_SGT, I1Ty, LV3), nullptr);
auto LV4 =
ValueLatticeElement::getRange({APInt(32, 15, true), APInt(32, 25, true)});
// Check getCompare with overlapping integer ranges.
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_SLT, I1Ty, LV4), nullptr);
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_SLE, I1Ty, LV4), nullptr);
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_NE, I1Ty, LV4), nullptr);
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_EQ, I1Ty, LV4), nullptr);
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_SGE, I1Ty, LV4), nullptr);
EXPECT_EQ(LV3.getCompare(CmpInst::ICMP_SGT, I1Ty, LV4), nullptr);
}
TEST_F(ValueLatticeTest, getCompareFloat) {
auto *FloatTy = IntegerType::getFloatTy(Context);
auto *I1Ty = IntegerType::get(Context, 1);
auto *C1 = ConstantFP::get(FloatTy, 1.0);
auto LV1 = ValueLatticeElement::get(C1);
auto LV2 = ValueLatticeElement::get(C1);
// Check getCompare for equal floating point constants.
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_OEQ, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_OGE, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_OLE, I1Ty, LV2)->isOneValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_ONE, I1Ty, LV2)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_OLT, I1Ty, LV2)->isZeroValue());
EXPECT_TRUE(LV1.getCompare(CmpInst::FCMP_OGT, I1Ty, LV2)->isZeroValue());
EXPECT_TRUE(
LV1.mergeIn(ValueLatticeElement::get(ConstantFP::get(FloatTy, 2.2)),
M.getDataLayout()));
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_OEQ, I1Ty, LV2), nullptr);
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_OGE, I1Ty, LV2), nullptr);
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_OLE, I1Ty, LV2), nullptr);
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_ONE, I1Ty, LV2), nullptr);
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_OLT, I1Ty, LV2), nullptr);
EXPECT_EQ(LV1.getCompare(CmpInst::FCMP_OGT, I1Ty, LV2), nullptr);
}
TEST_F(ValueLatticeTest, getCompareUndef) {
auto *I32Ty = IntegerType::get(Context, 32);
auto *I1Ty = IntegerType::get(Context, 1);
auto LV1 = ValueLatticeElement::get(UndefValue::get(I32Ty));
auto LV2 =
ValueLatticeElement::getRange({APInt(32, 10, true), APInt(32, 20, true)});
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_SLT, I1Ty, LV2)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_SLE, I1Ty, LV2)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_NE, I1Ty, LV2)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_EQ, I1Ty, LV2)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_SGE, I1Ty, LV2)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::ICMP_SGT, I1Ty, LV2)));
auto *FloatTy = IntegerType::getFloatTy(Context);
auto LV3 = ValueLatticeElement::get(ConstantFP::get(FloatTy, 1.0));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_OEQ, I1Ty, LV3)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_OGE, I1Ty, LV3)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_OLE, I1Ty, LV3)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_ONE, I1Ty, LV3)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_OLT, I1Ty, LV3)));
EXPECT_TRUE(isa<UndefValue>(LV1.getCompare(CmpInst::FCMP_OGT, I1Ty, LV3)));
}
} // end anonymous namespace
} // end namespace llvm
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